Running gear for high-speed suspension cars



MayV 19, 1931. c. STEDEFELD 1,805,928

RUNNING GEAR FOR HIGH SPEED SUSPENSION CARS.

u o llm- Filed sept. 1.951927 l `Patented Mey 19, 1931 CURT STEDEFELD, F HEIDELBERG, VGJIIRJVLAINTY 4 l RUNNING GEAR FOR HIGH-SPEED'SSPENSIN GARS Application mea september 19,1927, serial 110.220,5'35, nain Germany-'Maren 24,19%@5 'y ,j

Y This invention relates to running gear for high speed suspended railway vehiclesvv in which the individual running wheels lare borne at the ends of oscillating arms. If such vehicles are to be driven through the running 1 wheels the unsprung weight of the runningk wheels and the turning arms, that is, that part ofthe weight which is not supported by the springs, must not be'increased at all, or at most by a very slight amount by the driving Y motor or the drive transmitting gear. Wheel hub electric motors as in electric automobiles,

or flange motors on the ends of the running e `wheel axles as usual ingantries would raise l the unsprung weight of the running wheels just as much as the usual bearer arm carried motors in tramways, in which indeed only a part of the motor weight acts to increase the unsprung weight.

The present'invention solves the problem of providing a motor drive to the wheels of high speed suspended railway vehicles, which does not increase, or only imperceptibly increases the unsprung weight of the wheels and the forked arms thereof, the motor at the same time being in all cases easily accessible, andv which is contained exclusively within thev existing constructional members necessitated by the existing-vehicle profile, thus causing no additional air resistance. In considering this problem, two cases mustbe distinguished,-

rstly the driving of the running wheels by smally auxiliary motors which ycan only lde,

velop la low auxiliary power as is necessary for example for low speeds (in shunting the vehicles and so forth) ;y and secondly driving by po-werful motors for fast long runs,.which are arranged on the arm in relation towhich the wheel is sprung vor in the vehicle body. In

the iirst case the weight of the driving motor .is very small and itcan therefore according to the invention be simply borne on the turning arm as closely as possible to the turning axis so that the unsprung weight is only raised by an inco-nsiderable amount, while the motor remains freely accessible. In the second case the large driving motors appertain entirely Ato the sprung weight being borne vin a freely accessible and changeable manner on the, car-l vehicle body and Vconnected with the ruiming4 Y. wheelsbysui'table transmitting gear, f Y The invention will be more y particularly' described wit-h'reference to the accompanying drawings,'of which: e 5'5 Fig, l is a side-elevationand Fig. 2`is'a plan f inparti'al section of a run-ning 'wheel with a,4 motor attached to the turning arm; K 1 e 'F ig. .3 is aside elevation and F ig; l is la' plain in partial section of another embodiment;

, Fig.,5 is a side elevation VandIFLg; 6 a plan inpartial section `of athirdembodiment. f. v In the embodiments .illustrated in` Figures l. to6 the small driving motor a is, simply C, G5,

In the arrangement shown in sidefview` rFigure 'l and partly in plan, partlyr infhorif.

VZpontal section in Figure 2, the shaft y.of the 'A motor aicarries' a pinion Z1 meshing directly 75) with an'l externally toothed 'ringd on the'v running wheel f. Instead,` as shownfin side view in Figurez'f and partly'in plan view, partly in horizontal section in FigurejJ4, the pinionfb can lfneshwitlian internally toothed annulus Z on'the inside ofthe rimof the run-,-V ning wheel f. Or, as-shown in side View in Figure 5 and partly in plan, partly insection inl Figure 6, a countershaftgearcfcan bejin-v terposed between therpinion"` and `the [ex 8.5?"

ternally toothedjring cl.k e f e TheA inertia effect of the motor far, during oscillations when the vehicle is running {belcomes less yas its position 'approaches 'the' turning axis g-'-g of the arm h and varies 907 1 with thesquare of thisl distance. In the form sho-wn in Figures 5 and for example 7 the motorv axis is only one third as far from e f the axis g-g as the centre ofthe running n wheel f. If the running wheel f weighs for example 200 kg. and the motor a 50 kg. its" inertia eect during shocks between the wheel andl rail is'onlyv (l/3)2`.50:200j=1/36 that of the running wheel, and is therefore negligible. Even with the f arrangement lo@ (Fi res 3 and 4) where the motor a is about hal as far from the axis g--g as the wheel f its inertia effect is still only 2.50 200= 1/16 that of the wheel, whereas a` flange motor of equal weight on the running wheel axis would increase the effect by 12.50 200': 1/4 ofthe Weight of the wheel. It will also be seen that the motor fits into the profile of the vehicle forme-d by the running gear and the carrier arm z' and that it is freely accessible and can easily be changed.

I claim:

l. Running gear for high-speed springmounted suspension cars comprising, in combination with the running wheels horizontal forked arms hinged to the car body, each of said forked arms carrying one of said wheels, at least one motor mounted adjacent to the turning axes of said forked arms, and toothed gears for transmitting the torque Vvof said,

motors to the running wheels.

l2. Running gear for high-speed suspension cars comprising, in combination with the running wheels, horizontal forked arms hinged to the car body, each of said forked arms carrying one of said wheels, at least one motor mounted on said forked arms and adjacent the'axes thereof, and toothed gears for transmitting the torque of saidmotors to the -runningwheels 3. In a high speed suspension car, the combination with a car frame, of arms, means pivotally connecting said arms to said frame, spring' means connecting the free end of each arm with said frame7 running wheels carried by said arms, a driving motor mounted on one of said arms adjacent the pivot, and geared means Vfor transmitting the torque of said motor to said running wheels.

4. The invention as set forth in claim 3 l wherein said arms are bifurcateand the running wheels are mounted between the branches thereof and wherein said motor is mounted on one of said branches. i

5. The invention as set forth in claim 3` whereinsaid arms are bifureate and a por-k tion of said geared means is disposed be-V tween the arms thereof.

6. 'The invention as set forth in claim 3 wherein said motor is disposed substantiallyy within the profile established by the principal members of the vehicle.

In testimony whereof I have aiixed my signature.

' CURT STEDEFELD. 

